snd_usbmidi_detect_endpoints
err = snd_usbmidi_detect_endpoints(umidi, endpoints, MIDI_MAX_ENDPOINTS);
return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
return snd_usbmidi_detect_endpoints(umidi, endpoint, 1);
err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);
err = snd_usbmidi_detect_endpoints(umidi, &endpoints[0], 1);